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Subject: Re: Fritz 7.0.0.6 has futility pruning on as default.

Author: Vincent Diepeveen

Date: 06:20:07 01/28/02

Go up one level in this thread


On January 27, 2002 at 09:09:05, Ed Schröder wrote:

>On January 27, 2002 at 06:20:59, Bas Hamstra wrote:
>
>>[D]r2r1bk1/ppqb1ppp/2p1p3/6P1/2PPN3/PB3Q2/1P3P1P/1K1RR3 w - - Nf6!!
>>
>>Tao solves this in a couple of minutes (I believe 4 minutes to resolve the fail
>>high). But with futility pruning turned on it doesn't. I am curious how it
>>affects Fritz solution time. Fritz and CM see it pretty quick, in about 2
>>minutes.
>
>55 seconds for Rebel Century 4 (WB), A-1400, 60 Mb hash.
>
>Ed
>
>===========================================
>
>00:00:00.8	0,84	6	151310	Bc2 Be7 Qh5 g6 Qh6 a5
>00:00:01.9	0,76	7	288905	Bc2 Be7 Qh5 g6 Qh6 b5 Nf6+ Bxf6
>00:00:01.0	0,76	8	728845	Bc2 Be7 Qh5 g6 Qh6 b5 Nf6+ Bxf6
>00:00:03.5	0,67	9	1881667	Bc2 Be7 Qh5 g6 Qh6 Qf4 Re3 Bf8
>00:00:12.6	0,73	10	7730501	Bc2 Be7 Re3 b5 Qh5 g6 Qh6 Qf4
>00:00:25.5	0,75	11	17509807	Bc2 Be7 Re3 c5
>00:00:45.6	0,77	11	31601510	g6 hxg6 Ng5 f6
>00:00:55.7	0,77	11	38494175	Nf6+
>00:01:20.2	1,61	11	55729659	Nf6+ gxf6 gxf6 Bh6 Re5 Kh8 Qh3

diep also needs 11 ply but because of lower nps it takes of course longer
to get there, bit more than a minute for fail high. research takes another
minute.

00:05 0 0 436744 (108671) 7 -0.161 h2-h4 Bf8-e7 Ne4-c5 b7-b5 Kb1-a1 Be7-d6 Nc5-a
6
++ f3-g4
00:08 0 0 787005 (182417) 7 -0.074 Qf3-g4 Bd7-e8 h2-h4 b7-b6 Bb3-c2 b6-b5 c4-c5
00:20 0 0 2031839 (863240) 8 -0.036 Qf3-g4 b7-b5 c4xb5 c6xb5 Ne4-f6 Kg8-h8 g5-g6
 Qc7xh2 g6xf7
++ g5-g6
00:25 0 0 2617045 (966166) 8 0.574 g5-g6 f7xg6 Ne4-g5 Bd7-c8 c4-c5 Rd8-d5 Bb3xd5
 e6xd5
00:29 0 0 3072237 (991036) 9 0.578 g5-g6 f7xg6 Ne4-g5 Rd8-e8 c4-c5 Qc7-d8 Qf3-f7
 Kg8-h8 Ng5xe6 Qd8-e7
00:41 0 0 4389685 (1107408) 10 0.599 g5-g6 f7xg6 Ne4-g5 Rd8-e8 d4-d5 c6xd5 Qf3-f
7 Kg8-h8 Ng5xe6 Qc7-d6 c4xd5
01:14 0 0 8252472 (1188758) 11 0.751 g5-g6 f7xg6 Ne4-g5 Rd8-e8 d4-d5 c6xd5 c4xd5
 Kg8-h8 Qf3-h3 h7-h6 Ng5xe6
++ e4-f6
02:38 0 0 17103480 (2124274) 11 1.599 Ne4-f6 g7xf6 g5xf6 Bf8-h6 Re1-e4 Qc7-a5 Qf
3-h3 Qa5-f5 Qh3xh6 Qf5-g6 Qh6-f4 Kg8-f8
03:11 0 0 20863077 (2280172) 12 1.599 Ne4-f6 g7xf6 g5xf6 Bf8-h6 Re1-e4 Qc7-a5 Qf
3-h3 Qa5-f5 Qh3xh6 Qf5-g6 Qh6-f4 Kg8-f8
09:17 0 0 59717146 (4349876) 13 2.986 Ne4-f6 g7xf6 g5xf6 Bf8-h6 Re1-g1 Kg8-h8 Bb
3-c2 Rd8-g8 Rg1xg8 Ra8xg8 Qf3-h5 Rg8-g2 Qh5xh6 Qc7xh2 Qh6-f8 Rg2-g8

Note that diep has no mating extensions yet. this version only has singular
extensions and check extensions and a few other stupid extensions that might
not give anything here.

>>Best regards,
>>Bas.



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